John parker



-M dem J. PARKER & A. MoDONALD.

Piston Packing.

N. PEIERS, PHOTO-LITHOGRAPMEII, WASEINGTON. D c

Pa'tented Oct. 19, I880.

UNITED STATES To all whom it may concern Be it known that we, JoHN PARKER, of Bradford, in the county of York, Great Britain, and ALEXANDER MCDONALD, of the city of Halifax, Province of Nova Scotia, Dominion of Canada, have invented a new and useful Improvement in Piston-Packings for Steam and other Cylinders, for which Letters Patent were granted to John Parker, for Great Britain, No. 819, dated the 28th of February, 1878, sealed the 27th of August, 1878, and to Alexander McDonald, for the Dominion of Canada, No. 10,669, dated June 7, 1879; andwe do hereby declare that the said improvement is fully set forth in the following specification, reference being had to the accompanying drawings, in which-- Figure 1 is a plan view of a piston with said improvement applied and parts partly removed. Fig. 2 is a side elevation of same, partly in section, and parts removed.

The object of our invention is to form the metallic packing-rin gs of pistons for steam or other cylinders in such a manner that the friction between the circumference of the rings and the inside of the cylinder is greatly rednced,and to form the rings so that the flat surfaces of same fit tightly and adjust themselves against 'the flanges of the piston and junk-ring, and prevent the knocking of the packing-rings at the ends of the stroke and the escape of steam passing through the piston in consequence of the packing-rings becoming slack between the piston-flanges and junk-ring.

The invention consists in the packing being in two parts, each part having serrated teeth or inclined planes cast or cut on the edge where they join. Likewise, on each part there are cast or otherwise secured internally lugs, feathers, or strips, to receive the action of springs, of which latter one end rests against a lug on the upper half and the other,end against a lug on the lower half, causing the moving around in opposite directions of the two rings until the before-named serrated teeth or inclined planes are broughtfirmly against each other. By these means the rings are kept rigid and steam-tightbetween the piston-flange and j unk-rin g, and the knocking of the packlngrings at the ends of the stroke is prevented.

PATENT OFFICE.

. JOHN PARKER, OF BRADFORD, GREAT BRITAIN, AND ALEXANDER MCDONALD, OF HALIFAX, NOVA SCOTIA, CANADA.

PISTON-PACKING.

SPECIFICATION forming part of Letters Patent No. 233,430, dated October 19, 1880.

Application filed. July 23, 1880. (No model.) Patented in England February 28, 1878, and in Canada June 7, 1879.

A is the body of the piston 5 B, the junkring 5 C, the piston-rod; D, the upper part of the packing; D, the lower part, and d the serrations or inclined planes.

E E represent, respectively, the lugs on the upper and lower part of the piston-packing, against which lugs press the springs F F, thereby forcing each part of the packing transversely in an opposite direction up the inclined planes d 61, against the face of the piston-body A and j unk'ring B, keeping the piston at these places perfectly steam-tight, and always taking up the least wear that is caused thereat. The action of springs F F have at the same time the tendency to open up the rings, so as to insure tightness of piston in cylinder.

Lugs E E and spring F are shown in elevation at X X, Fig. 2, the piston-body being partly removed.

Each part of the packing is cut in one place, as shown at G G, to insure tightness, and tongues H H are inserted.

The packing is free to revolve and does revolve in the cylinder, thereby insuring evenness of wear of both cylinder and packing.

What we claim as new, and desire to secure by Letters Patent, is

1. Packingrings provided with serrated teeth or inclined planes on their upper or lower edges. substantially as described.

2. The combination, with packing-rings having serrated teeth or inclined planes on their contiguous edges, of springs for acting on said rings, substantially as described.

3. The combination, with the body of a piston and junk-rings, of the packing-rings provided with serrated teeth or inclined planes, lugs on said rings, and springs, substantially as set forth.

JOHN PARKER. ALEXR. MCDONALD.

Witnesses to John Parkers signature:

J OHN GILL, R. RICHARDSON.

Witnesses to Alexander 'McDonalds signature:

J. DUFFUR HARRIS, WALTER F. MEYNELL. 

